feat(otopcua): add ITagDiscovery.RediscoverPolicy + per-driver assignments (follow-up B)

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT/TwinCATDriver.cs

@@ -377,6 +377,14 @@ public sealed class TwinCATDriver : IDriver, IReadable, IWritable, ITagDiscovery
 
     // ---- ITagDiscovery ----
 
+    /// <summary>
+    ///     Run-once: <see cref="DiscoverAsync"/> emits pre-declared tags and (when
+    ///     EnableControllerBrowse is set) fully awaits the controller symbol browse within the
+    ///     single call, streaming the complete node set in one pass — nothing fills in
+    ///     asynchronously after connect, so a single discovery pass is sufficient.
+    /// </summary>
+    public DiscoveryRediscoverPolicy RediscoverPolicy => DiscoveryRediscoverPolicy.Once;
+
     /// <summary>Discovers devices and tags from ADS configuration and optionally controller symbols.</summary>
     /// <param name="builder">Address space builder for adding discovered nodes.</param>
     /// <param name="cancellationToken">Cancellation token.</param>